Sumitomo Metal Mining Company, Ltd.

Tohoku University

Tetsufumi Komukai

Yuki Furuichi

Jun Yokoyama

Taira Aida

Toshiyuki Osako

Tomoko Nakayama

Takahiro Toma

Mitsuru Yamauchi

Jiro Okada

Kentaro Kondo

Hiroyuki Toya

Yasutaka Kamata

Atsushi Fukui

Kensaku Mori

Koji Yamaji

Ryozo Ushio

Masanori Takagi

Katsuya Inoue

Jun Suzuki

Isao Ando

Toshio Morimoto

Tatsuya Takahashi

Tai Ito

Hideki Kato

Shoji Takanashi

Takahiro Ogawa

Hiroko Senba

Masato Kakihana

Satoko Tezuka

Takashi Ozaki

Eriko Sato

Hirotaka Minami

Yuji Takatsuka

The cathode active material for a lithium ion secondary battery is produced from spherical particles made of lithium nickel cobalt composite oxide represented by general formula: LiNiCoMO(wherein M is at least one element selected from among Mn, V, Mg, W, Mo, Nb, Ti, and Al and x, y, and z satisfy 0<x≤0.35, 0≤y≤0.35, and 0.97≤z≤1.20, respectively) and having a volume average particle diameter MV in a range of preferably 8 to 30 μm, wherein an area ratio of a lithium compound unevenly distributed on surfaces of the particles in a SEM image is 5% or less. The spherical particles preferably have a crystallite diameter in a range of 50 to 200 Å as determined from a full width at half maximum, FWHM of diffraction peak of (003) plane obtained by X ray diffraction by using Sherrer formula.

Cathode active material for lithium ion secondary battery and method for producing same

The present invention has an object to provide a positive electrode active material for a non-aqueous electrolyte secondary battery which can improve stability of a positive electrode mixed material paste when manufacturing the secondary battery and can increase the battery capacity and improve output characteristic of the secondary battery. A method for manufacturing a positive electrode active material for a non-aqueous electrolyte secondary battery includes mixing fired powder containing lithium-metal composite oxide having a crystal structure of a layered structure with water, and drying this mixture. The fired powder includes secondary particles formed by agglomeration of primary particles. Water is mixed thereto with an amount with which pH of a supernatant obtained after 5 g of the positive electrode active material is dispersed into 100 mL of pure water followed by statically leaving the dispersion solution for 10 minutes falls within a range of 11 to 11.9 at 25° C.

Positive electrode active material for non-aqueous electrolyte secondary battery and method for manufacturing the same, positive electrode mixed material paste for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

A nickel composite hydroxide includes nickel, cobalt, manganese, and an element M with an atomic ratio of Ni:Co:Mn:M=1−x1−y1−z1:x1:y1:z1 (wherein M is at least one element selected from a group consisting of a transition metal element other than Ni, Co, Mn, a II group element, and a XIII group element, 0.15≤0.25, 0.15≤y1≤0.25, 0≤z1≤0.1), the nickel composite hydroxide having a cobalt or manganese rich layer from a surface of a particle of the secondary particles toward an inside of the secondary particles and a layered low-density layer between the cobalt or manganese rich layer and a center of the particle of the secondary particles, and a thickness of the cobalt or manganese rich layer and low-density layer is 1% or more and 10% or less to a diameter of the secondary particles.

Nickel composite hydroxide, method for producing nickel composite hydroxide, positive electrode active material for lithium ion secondary battery, method for producing positive electrode active material for lithium ion secondary battery, and lithium ion secondary battery

The present invention provides a positive electrode active material for a non-aqueous electrolyte secondary battery including a lithium metal composite oxide powder represented by a general formula: LiNiCoMO, wherein 0&#x3c;x&#x2264;0.35, 0&#x2264;y&#x2264;0.35, 0.95&#x2264;z&#x2264;1.30, &#x2212;0.15&#x2264;&#x3b1;&#x2264;0.15, and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti and Al; and a coating layer placed on particle surfaces of the lithium metal composite oxide powder; wherein the coating layer is a mixed-phase of a crystalline phase and an amorphous phase.

Positive electrode active material for non-aqueous electrolyte secondary battery

Provided is a positive electrode active material for a nonaqueous electrolyte secondary battery including a LiNi composite oxide having low internal resistance and excellent thermal stability. The positive electrode active material is obtained by performing a water washing process using a water spray on a LiNi composite oxide powder obtained by a firing step until the filtrate has an electric conductivity of 30 to 60 mS/cm, and then dried, where the LiNi composite oxide is represented by the composition formula (1): LiNiM1O, where M1 represents at least one kind of element selected from transition metal elements other than Ni, group 2 elements, and group 13 elements, and 0.01&#x2264;a&#x2264;0.5, and 0.85&#x2264;b&#x2264;1.05.

Positive electrode active material for nonaqueous electrolyte secondary batteries, method for producing same, and nonaqueous electrolyte secondary battery

A positive electrode active material for a non-aqueous electrolyte secondary battery includes a lithium metal composite oxide, wherein the lithium metal composite oxide is represented by a general formula: LiNiCoDEO(wherein, in the formula, 0.05&#x2264;x&#x2264;0.35, 0&#x2264;y&#x2264;0.35, 0.002&#x2264;z&#x2264;0.05, 1.00&#x2264;a&#x2264;1.30, an element D is at least one type of element selected from Mn, V, Mo, Nb, Ti, and W, and an element E is an element forming an alloy with lithium at a potential more noble than a potential in which ions of the element E are reduced), wherein the lithium metal composite oxide includes primary and secondary particles formed by aggregating the primary particles, wherein an oxide containing the element E exists at a surface of at least either of the primary and secondary particles.

Positive electrode active material for non-aqueous electrolyte secondary battery, process for manufacturing positive electrode active material for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery using the positive electrode active material

A positive electrode active material for nonaqueous electrolyte secondary batteries and production method thereof that are able to improve the stability of positive electrode mixture material pastes used to produce nonaqueous electrolyte secondary batteries, as well as to improve the output characteristics and charge/discharge cycle characteristics of secondary batteries. A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries includes mixing a fired powder formed of a lithium-metal composite oxide having a layered crystal structure, a first compound which is at least one selected from a group consisting of a lithium-free oxide, a hydrate of the oxide, and a lithium-free inorganic acid salt, and water and drying a mixture resulting from the mixing. The fired powder includes secondary particles formed by agglomeration of primary particles. The first compound reacts with lithium ions in the presence of water to form a second compound including lithium.

Positive electrode active material for nonaqueous electrolyte secondary batteries, production method thereof, positive electrode mixture material paste for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

The presently disclosed subject matter is directed to a positive electrode active material for a non-aqueous electrolyte secondary battery including a lithium transition metal-containing composite oxide, comprising secondary particles formed by aggregates of primary particles. The secondary particles comprise: an outer-shell section formed by an aggregate of the primary particles; at least one aggregate section formed by an aggregate of primary particles and existing on an inside of the outer-shell section, and electrically and structurally connected to the outer-shell section; and at least one space section existing on the inside of the outer-shell section and in which there are no primary particles. The average particle size of the secondary particles being within the range 1 &#x3bc;m to 15 &#x3bc;m, an index [(d90-d10)/average particle size] that indicates a spread of a particle size distribution of the secondary particles being 0.7 or less, and the surface area per unit volume being 1.7 m/cmor greater.

Transition metal-containing composite hydroxide and manufacturing method thereof, positive electrode active material for a non-aqueous electrolyte secondary battery and manufacturing method thereof, and non-aqueous electrolyte secondary battery

A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, includes: a mixing step of adding a W compound powder having a solubility A adjusted to 2.0 g/L or less to a Li-metal composite oxide powder and stirring in water washing of the composite oxide powder, the solubility A being determined by stirring the W compound in water having a pH of 12.5 at 25&#xb0; C. for 20 minutes, the composite oxide powder being represented by the formula: LiNiCoMOand composed of primary and secondary particles, followed by solid-liquid separation, to thereby obtain a tungsten-containing mixture with the tungsten compound dispersed in the composite oxide powder; and a heat-treating step of heat-treating the mixture to uniformly disperse W on the surface of primary particles and thereby form a compound containing W and Li from the W and Li in the mixture, on the surface of primary particles.

Positive electrode active material for nonaqueous electrolyte secondary batteries, and production method thereof

Provided is a positive electrode active material that has high output characteristics and battery capacity when used for a positive electrode of a nonaqueous electrolyte secondary battery and can inhibit gelation of positive electrode mixture paste. A method for producing the positive electrode active material is also provided. A positive electrode active material for a nonaqueous electrolyte secondary battery contains a lithium-nickel-cobalt-manganese composite oxide represented by General Formula (1): LiNiCoMnBM1Oand having a hexagonal layered crystal structure. The lithium-nickel-cobalt-manganese composite oxide contains a secondary particle formed of a plurality of flocculated primary particles and a boron compound containing lithium present at least on part of surfaces of the primary particles. A water-soluble Li amount present on the surfaces of the primary particles is up to 0.1% by mass relative to the entire amount of the positive electrode active material.

Positive electrode active material for nonaqueous electrolyte secondary battery, method for producing the same, and nonaqueous electrolyte secondary battery containing the positive electrode active material

Provided is a method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, the method including: a mixing step of obtaining a W-containing mixture of Li metal composite oxide particles represented by the formula: LiNiCOMOand composed of primary particles and secondary particles formed by aggregation of the primary particles, 2 mass % or more of water with respect to the oxide particles, and a W compound or a W compound and a Li compound, the W-containing mixture having a molar ratio of the total amount of Li contained in water and the solid W compound or the W compound and the Li compound of 3 to 5 with respect to the amount of W contained therein; and a heat treatment step of heating the W-containing mixture to form lithium tungstate on the surface of the primary particles of the Li metal composite oxide particles.

Positive electrode active material for nonaqueous electrolyte secondary battery, method for producing same, and nonaqueous electrolyte secondary battery using said positive electrode active material

Provided is a method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, including: a water-washing step of mixing, with water, Li&#x2014;Ni composite oxide particles represented by the formula: LiNiCoMOand composed of primary particles and secondary particles formed by aggregation of the primary particles to water-wash it, and performing solid-liquid separation to obtain a washed cake; a mixing step of mixing a W compound powder free from Li with the washed cake to obtain a W-containing mixture; and a heat treatment step of heating the W-containing mixture, the heat treatment step including: a first heat treatment step of heating the W-containing mixture to disperse W on the surface of the primary particles; and subsequently, a second heat treatment step of heating it at a higher temperature than in the first heat treatment step to form a lithium tungstate compound on the surface of the primary particles.

Method for producing positive electrode active material for nonaqueous electrolyte secondary battery

A method produces a positive electrode active material that does not impair the original battery characteristics of the positive electrode active material. The method can improves water resistance, and suppress the gelation of a positive electrode mixture material paste. The method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries can include a mixing step of preparing a mixture including fine carbon particles, an organic dispersant, a hydrophobic coat forming agent, an organic solvent, and positive electrode active material particles, a drying step of drying the mixture to obtain the mixture containing the organic solvent in a reduced amount, and a heat treatment step of heat-treating the mixture containing the organic solvent in the reduced amount to obtain a coated positive electrode active material.

Method for producing positive electrode active material for nonaqueous electrolyte secondary batteries, positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

A positive electrode active material for nonaqueous electrolyte secondary batteries has a high charge/discharge capacity and produces high output, as well as has high filling ability. The positive electrode active material includes lithium-nickel composite oxide particles are formed by agglomeration of multiple primary particles, include pores, and have a layered crystal structure. The lithium-nickel composite oxide particles have an average particle size of 15 &#x3bc;m or more and 30 &#x3bc;m or less. The percentage of an area of the pores measured by a cross-sectional observation of the lithium-nickel composite oxide particles with respect to a cross-sectional area of the lithium-nickel composite oxide particles is 1.0% or more and 5.0% or less. A lithium-tungsten compound containing tungsten and lithium is present on the surface of and inside the secondary particles. The lithium-tungsten compound is present on at least part of the surface of the primary particles.

Positive electrode active material for nonaqueous electrolyte secondary batteries, production method thereof, and nonaqueous electrolyte secondary battery

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Niihama, Japan

Tetsufumi Komukai